Concrete-mixer.



- M. F. SANBORN.

CONCRETE MIXER.

APPLICATION FILD AUG.1.4 1908.

Patented Dec. 31,1912.

Mer-0607- UNITED STATE OFFICE.

MOBTON F. SANBORN, OF SOMERVILLE, MASSACHUSETTS, ASSIGNOR TO MATTHEW HOWARD REED, 0F PLZSBURGH. PENNSYLVANIA.

CONCRETE -MIXLER.

Application tiled August 14.

T0 all whom it may concern: Y

Be it known that I, MoRToN F. SANonN, a citizen of the United States, residing nt Somerville, eoiility of Middlesex, and Stine of Massachusetts, have invented an Improve ment in Concrete-Mixers, of which the fob lowing description, in connection witlirthe accompanying drawing, is a specification.

like letters on the drawing representing like iernal annular ribs 7 and is mounted for parts. k

This invention relates to apparatus tor mixing concrete and other granular nia- 'terial, of the type wherein a rotary drinnv is arranged to receive the materials to be mixed, the druinhavin internal fiangesafor effectively mixing toget yer the different niaterials and for lifting them when mixed and depositing the same in a discharge chute.

One of the objects of my invention is the production of a novel form of drum whereby the charging can -be done in a very easy manner, the materials to be mixed being introduced at one end of the drum near its periphery, enabling a low charging chute to be emplo ed.

Another o ject of my invention is the pro duction of improved means within the drain for more' etlicientlyfand thoroughlyy milan Af, the materials introduced thereinto, and for directing the mixed charge tothe outlet or discharge chute.

The construction and. arrangement of the discharge chute also involves novel features f of construction and arrangement, the'various novel features of my invention being tully described in the subjoined specification :uid

particularly pointed out in the following claims. n l

Figure 1 is a vertical sectional view ov a mixing apparatus embodying one forni of he seen that the carrie'rs form a series of toillust rate the relative arrangement of the mixing, directing and liftingr members or flanges; Fig. 5 is a modification of tho lift ing flanges to be referred to.

In the drawings a revoluble cylinder or drum 1 has at its discharge end an annular head 2, through the central opening 3 oi' Specication of Letters Patent.

Patented Dec. 31, 1912. 190s. semi No. 448,508.'

which the discharging chute is extended into the interior oit' the drum, and at its opposite i end the drum is provided with an intiirned annular tlange or lip 4, While a circular head is secured within the drum, set in from the plane of the flange' 4, as shown in Fig.

l, and leaving an annular space 6 between die drum and the periphery of the head.

The drum is shown as provided with exrotation on a horizontal axis upon rolls 8 carried in a suitable manner on a base frame 9, the ribs 7 coperating with said rolls to prevent movement of the drum in an axial direction. A ring-gear 10 on the drum is adapted to mesh with any suitably driven actuating gear, not shown, and of usual construction in apparatus of this class, whereby rotation of the drum is elfected. Upon the inner surface of the drum I ixedly secure series of flanges 11, 12, the arrangement whereof is best shown in Fig. 4,`said flanges being arranged in parallelism, and diagonally to the ends of the drum, but at an angle of less than 40. The inner diagolfnaily arranged edges e of said iianges or carriers 11. 12, are preferably spaced outwardly radially away from the inner edge of flange 4 to provide clearance space for the inner end of chute C. The oiiterends of ali the carriers extend to and are fixedly connected with the Bange 4, though ot' somewhat less depth, as shown in Fig. 1, but the carriers 11 at their inner ends stop in the zilaiie of the heail, while the` carriers 1Q extend inward past lsuch head and beyond 'the center of the drum. the head being se# cured to the carriers and rigidly sustained thereby.

IFrom the foregoing description it will inlet pockets which ary open between the head 5 and fiange 4, t e open tops ot' the pockets as they pass under the` charging -cliu-te (l, Fig. l, being adapted to receive chiite (l is carried upward in a curve eonrenti-io withfthe pocket openings. :is :it-c, Fig. Q, to better direct the elnirge into thev pmkets, and referring .to Figur] it will be 110.

seen that `the chute is brought low down,

owing to the construction of the drinn, mak.

ing it much easier to feed the material into the chute. Owing to the relatively flat curve of the chute I am enabled to give it much less slope that is usual, as the material slides down easily and steadily to the pockets. llhen the material enters the pockets the carriers conduct it into the interior' of the drum as the latter revolves. and by making said carriers at an angle of less than 40 they act to slide or carry the material inward beyond the plane of the head 5, rather than lifting it.

I have shown two of the shorter carriers 11 interposed between eachl pair of the longer carriers 12, and across the inner ends of the latter, but beyond them, I fix flanges 13 which constitute deflcctors, the material sliding ont ot' the pockets and against the' defleetors. as shown b v brken lines. Fig. 4,

so that its direction ischanged and the parts thereof are mixed together thoroughly. 'lhe width of the front ends of carriers 1 1 and 12 is somewhat less than the width of flange -t so .that the inner edges of the carriers are thus located inwardly bevond the flange edge, giving clearance for the chute terminal and incoming raw material and insuring its 80 retention during rotation of the drum. Al-

ternating with the deflectors a series of bent flanges 14 are fixed on the inner surface of the drum, constituting litters, the short outer walls extending to the annular head 2 of the drum, Fig. 1, while their inner walls V15 are made long enough to extend across the defiectors. These walls 15 receive the mixed material, agitate and change its direction again, and conduct it to the bottoms of the lifters, which carryl the mixed material up andthen drop it onto the bottom of the drum. Thus a most thorough and intimate mixing of the parts ofthe charge is effected, the incoming portions being quickly directed by the carriers to the interior of the drum as one pocket after another receives its load from the chute C.

The mixingproceeds first by the coperation of the carriers and the deiectors with the charge, and then is continued -by the alternate liftin and dropping of the material bythe li ters 14, as wil be obvious. When the-charge has been thoroughly mixed the discharge chute is positioned to receive the charge from the ',lifters and to convey it out of the drum at the discharge, end thereof. As the carriers 12 are lon r than the deectors, and extend beyond t e ends of the sides 15 of thelifters, toward the disebar e endv of the drum, the material will final y reach'v the litters, after .various changes in direction which insure proper and thorough mixing, and if the drum is lvery large more than one deflector may be 55 provided for each of the long carriers. The

discharge chute D is curved in cross section. and' its sides increase in depth gradually from itsl inner to, its outer end, a; shown in Fig. l, and when in operative, full line position. its bottom has the proper slope to enablethe mixed material to' slide down the chute to be discharged into carts, wheelbarrows. or other suitable receptacles. The chute is suitably bolted to a plate 16 and extends through an-opening therein, the plate in turn being secured to a metal ling 1T which is rotatable in a vertical plane ina curve'd seat 18, Fig. 3, secured to a suitable stand or frame 19. Inturned ears 2t) on the 'seat 1S, at thev back and front of 80 Athe seat retain the carrier ring in upright position.

When the mixed material is to be dis charged from the drum the chute D is posi- 4 tioned as shown in full lines, Fig. 1, and as 35 the lifters 1l carry the material'up the side of the drum the same will be dropped onto the wide and shallow upper end of the chute, sliding down the latter to its outer, delivery end. When it is desired to stop the discharge the chute is turned upside down, into dotted line position, Fig. 1, by rotative movement of the annular carrier 17, so that the convex bottom of the chute will shed the material during the mixing of a fresh charge. Such rotative movement of the chtite may be effected by means of handles 21 secured to the plate 16 and offset to clear the ea rs 2 0. Whenl the chute is turned t0 inoperative position the bottom inclines downou ward and inward toward the charging end of the drum, so that the material falling upon the chute bottom is directed inward, away from theopening 3, while the delivery end of the chute is elevated out of the wa. 105

'lhe turning of the chute is very easiy effected as itdoes not have to turn or 1i 'against the weight of the concrete which may be in itl at the time it is desired to stop the discharge.

l have shown the blades or flanges which constitute the carriers `11 and 12 as flat. pieces of metal, but if desired they may be bent or curved transversely, one such variation being shown in Fig. 5, wherein the c arriers 11X, 12* are shown with their upper: edges bent over, as 'at 22. This change will fbe desirable in handling some kinds of madrum' havin discharge'en and a circu ar ead set in from the oppositeend of the drum and permanentl j yclosing the center lthereof means whol y'with'in the c lindrical wall vof the drumand betweent e latter-and the periphery .of the closed lhead to receive the material outside said head and introduce it to the interior of the drum beyond the head, and means on the interior of the drum to mix and vlift such'material and carry it toward t-he open dischar e end.

2. In a mixer, in com ination, a revoluble drum having a'central opening at its discharge end, a circular head set in from the o posite end of the drum and permanently c osing the center thereof, a series of annularly arran ed inlet pockets between the periphery of t e circular head and wall of the drum and extended to the end of the latter outside the head, said ockets being open toward the axis of the rum exterior to the head, means to direct the material to the pockets near the bottom of the series of pockets, and means to discharge the mixed charge at the centrally open end of the drum.

3. In a mixer of the class described, a revoluble drum having a centrally open head at one end, a circular head set in from the other end of the drum and permanently clos ing the central portion of the drum, diagonally arranged blades providing material inlet pockets periphcrally arranged around the circular head and exterior thereto but within the cylindrical wall of the drum outside of the head, means to charge the material into said pockets, and means to discharge the mixed materials through the centrally open head of the drum.

4. A revoluble drum having a centrally open receiving end, a circular head set in therefrom and permanently closing the interior of the drum, a series of parallel and diagonally arranged flanges constitutin carriers on its interior at its charging end to advance the material toward the discharge end, deflectors crossing the planes of some of the carriers beyond their inner ends, and lifters separated from the inner ends of the carriers and adjacent the discharge end of the drum, the deflectors directing the material thereto, the inner side of each lifter being long and extending beyond the nearer end of the next deflector, and the outer ends of the carriers projecting beyond the circular head to the adjacent end of the drum forming pockets to receive the material charged into the drum.

' 5. In a mixer, in combination, a revoluble drum having a centrally open inwardly anged front, a centrally arranged transverse circular head member set in from the open front and permanently closing the center of the drum, means wholly within a centrall o 'en head -at its the' cylidrical'wallbf the drum and between itl andlsa'id circular'member to receive thematerial outside said circular head -member 'and introduce it to" the"v interior 'of the drumbeyond the circular member, 'means on the interior of thedrum to mix and lift the material and carry it toward the other end of the drum, and a dischar e chute extendin outwardly through sai other end.

6. T e combination with the rotatable mixing drum having an annular fiange at its front end providing a central unobstructed charging o ning, of aseries-of diagonally arranged lades having their front ends of less width than the flan e and their inner diagonally arranged e ges spaced outwardly radially away from the inner annular edge of said flange, said blades being in contact with and secured to said flange for a portion of its width and extending diagonally backward therefrom within the drum for a portion only of its periphery, each blade overlapping the next adjacent blade with an intervening space, and operable to feed material into the interior of the drum upon its rotation.

7. The combination with the `mixing drum having an annular flange at its front end providing a central unobstructed chargin opening, and an inwardly located circu ar head separated from the drum by an annular space, of a series of overlapping di agonally arranged flat blades havin their inner ed es bent over or deflecte said blades being secured to said flange and extending iiiwardly and backwardly there from with intervening spaces and operable to feed material into the interior of the drum upon its rotation.

8. In a mixer of the class described, the combination of a cylindrical rotatable drum having annular inwardly turned terminal walls or flanges forming a centrally open head at each end and providing an o en charging end and an open delivery en a series of diagonal carriers secure to the inner face of the drum extending diagonally backward from the annular wall at the charging end forming a peripheral series of pockets, some of said carriers being extended inwardly beyond intervening ones thereof toward the delivery end of the drum, and a series of bent flanges forming lifting pockets'secured to the inner face of the drum adjacent to its delivery end and ada ted to receive material from said exten ed carriers, substantially as set forth.

9. In a mixer of the class described, the combination of a cylindrical rotatable drum having annular inwardly turned terminal walls or flanges forming a centrally open head at each end and providing an o en chargin end and an open delivery en a series o diagonal carriers secure to the inner face of the drum extending diagonally backward from thev annular wa'll at the of directionof the extended carriers and charging end forming a peripheral series of. annularly between them and -said pockets,

pockets, some of said carriers being exsubstantlally as set'forth.. v

Ytended inwardly beyond intervening ones In testimony whereof, l havesigned my 15 5 thereof toward the delivery endl of the drum, name to this specification, in the presence of a series .of bent flanges. forming lifting I two subscribing Witnesses. Y

` pockets secured to the inner face of the T l drum adjacent to ite delivery end and MORTOL F SANBORN adapted t-o'receive material from said ex- VVit-nesses:

10 tendedcarriers, and a serieso-f defiecting JOHN C. EDWARDS,

` flanges arranged diagonally across the line FREDERICK S. GREENLEAF. 

